Typewriter



B. BAUMANN May 10, 1938.

TYPE-WRITER Filed May 9, 1934 2 Sheets-Sheet 1 In vnton 5. w Win71 B. BAUMANN May 10, 1938.

TYPEWRITER Filed May 9, 1954 2 Sheets-Sheet 2 Inventor:

5. 54 m?? aw i enema M4 10. 1938 PATENT OFFICE I TYPEWRITER Berthold Baiimann, Nuremberg, Germany, as-

signor to Triumph-Werke Nuernberg A.-G.,

Nuremberg, German Application May 9, 1934, Serial No. 724,811 In Germany May 13, 1933 3 Claims.

This invention relates to a novel kind of actuation for the type levers of typewriters, in which two intermediate levers are interposed between the key lever and the type lever.

the type lever experiences an additional accelerationin about the second half of its swinging motion towards the platen, but that the pressure applied to the key remains, practically the same 10 and equally soft and elastic during depression of the key. As the return swing of the type lever also takes place with an additional acceleration,

a very great increase in typing speed results,

-which could not be obtained with the typewriting systems hitherto known.

While type lever actuating systems are known, in which the type lever is accelerated towards the end of its swinging motion, in the arrangement according to the invention this known acceleration has an additional positively regulatedacceleration imparted to it.

A further feature of the invention consists in this, that for obtaining the additional acceleration of the typelever, the second intermediate lever which engages with it has, besides the usual engaging pin, a second engaging pin lying further away from the point of rotation of the intermediate lever andthat the type lever has in addition to its usual slot forthe first engaging pina second engaging slot for the second engaging pin. The means employed for obtaining these conditions of motion are characterized by great constructional simplicity which ensures a reliable action;

In the accompanying drawings a constructional example of the type lever-actuating means ac,- cording to the invention is illustrated,

Fig. 1 showing the actuating system in the position of rest,

Fig. 2 the second intermediate lever to an enlarged scale in its initial and its final position, and

Fig. 3 an intermediate position of the actuating members, which is marked :1: and from which onwards to the known acceleration of the typelever an additional acceleration is added.

In all three figures of the drawings 11 positions are indicated by the numerals 0 to 10 of the separate actuating members and a special 0 position :17 from which onwards the additional acceleration commences.

The actuating system consists of the key lever b which is pivoted on a bare and the pin 0 of which engages in the slot d of the first intermedate lever e, the pin for which is connected It has this 5 advantage over the known arrangements, that a s from the bearing shaft'i is greater than the by the pull bar g with the pin h of the second intermediate lever is which is pivoted on the bearing shaft 2'. The pin m of this intermediate lever k engages in the slot 11 of the type lever 11 which is pivoted on the bearing shaft .0 and the type 5 head q of which, when in its extreme position. strikes against the platen r. The members of the system so far described are known. A new feature is the provision of a second pin s on an arm t of the second intermediate lever k and the provision of a second slot u in the type lever p. Through the provision of these means ac cording to the invention the additional acceleration of the type lever is obtained in the following manneri 15 The key displacement is divided into ten equal parts which are marked by horizontal lines 0 to I0, so that there are 11 positions. To these 11 positions 0 to H] of the key lever there correspond the positions 0 to II] of the pin 1'' on the first intermediate lever e. Through the conversion of the almost straight line downward motion of the pin 0 into the rotary motion of the first intermediate member e, an acceleration of the pin f is obtained in a known manner, which will be seen from the constantly increasing paths between the individual positions. The distance of travel 9 to ill of the pin 1 is already considerably reater than the distance D to I. The motion oi the pin s and that-of the pin m take place in a similar manner, as long as the latter is in engagement with the slot 11, and consequently the motion of the type head q in the first half of its swinging motion.

In an intermediate position, however, (Fig. 3) which is marked 3:, a change in the velocity and the acceleration occurs. In this position the pin m leaves the slot 11 of the type lever p and the pin s enters its slot u. As the distance of the pin distance of the pin m from this hearing shaft (Fig. 2), an acceleration takes place, that is to say the type lever 10 is turned more rapidly from the position a: onwards. Owing to the greater radius there is however not only an increase in the angular speed, but also an acceleration of this increased speed. as owing to the slot guide of the pin s in the slot 11. the distance of the pin s from the fulcrum o constantly decreases. These increases in the speed and the acceleration of the type lever could not be obtained with the toothed gearing hitherto used.

In Fig. 2 the enlargement of the increasing distances of travel due to the greater radius i-s instead of i--m will be seen, while Fig. 1 shows I the increasing distances which correspond to equal distances in the depression of the key, more particularly from the position a: onwards.

What I claim is:

1. A type bar action for typewriters, comprising in combination a key lever, a type lever, a traction bar interposed between said levers, an intermediate lever connected with one end of said traction bar, a driving connection, between the key lever and said intermediate lever for imparting movement to the intermediate lever and traction bar with continuously increasing accel eration during the entire range of movement of 7 said key lever and a second intermediate lever connected with the opposite end of the traction bar and having driving means arranged to engage the type lever to transmit the motion of the traction bar to the type lever and further driving means on the second intermediate lever arranged to engage the type lever subsequently to the first mentioned driving means and with a continuously increasing leverage so as to impart a final movement to the type lever with an increased acceleration over that applied thereto by the first mentioned intermediate lever and produce a rapid initial return movement of the type lever.

2. A type bar action for typewriters, comprising in combination a key lever, a type lever, a traction bar interposed between said levers, an intermediate lever connected with one end of said traction bar, a driving connection between the key lever and said intermediate lever for imparting movement to the intermediate lever and traction bar with continuously increasing acceltraction bar.

motion of the traction bar to the type lever and a second driving member on the second intermediate lever at a'difierent distance from the pivotal axis thereof than the first driving member and arranged to engagethe type lever subsequently to the first mentioned driving mem-v ber and with a continuously increasing leverage so as to impart afinal movement to the type lever with an increased acceleration over that applied thereto by the first mentioned intermediate lever and produce a rapid initial return movement of the type lever.

3. A type bar action for typewriters, comprising in combination a key lever having a driving pin thereon, a traction bar, an intermediate lever connected with one end of said traction bar and having a slot:therein in engagement with said driving pin and so directed that during the movement of the key lever the driving pin travels towards the pivotal axis of the intermediate lever so as to actuate the intermediate lever with continuously increasing acceleration during the entire range of movement of the key lever, a second intermediate lever connected with the opposite end of the traction bar and having a driving pin thereon, a type lever having a slot therein in engagement with the driving pin on the second intermediate lever for imparting initial movement to the type lever and a second driving pin on the second intermediate lever at a greater distance from the pivotal axis thereof than the first mentioned driving pin thereon, the type lever having a second slot arranged for en'- gagement with the second driving pin on the second intermediate lever for imparting final movement to the type lever with an increased acceleration over that applied thereto by the 

